this could be a lot of things…
is the contiuous rasterization option on? its a check box in the switches pane of the timeline taht looks like a little sun.
are your seeing this on a broadcast monitor or on your computer screen? if it’s on a broadcast monitor it may be an interlacing issue. is it more of a jitter issue on horizontal or near horizontal edges or details? then it probably is a field issue, try a little fast blur, vertical only and repeat edge pixels. if it’s moving, turning motion blur on too may help.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW